Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java @ 2394:02ac373b6d69

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Added chart helper function to determine the min and max bounds (x and y) for TimeSeriesCollections. flys-artifacts/trunk@4016 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 10 Feb 2012 08:43:06 +0000
parents 2b232871ba28
children bece6f604899
rev   line source
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60615235e951 Added a ChartHelper class that currently contains a method to compute the xy ranges of an XYDataset.
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1 package de.intevation.flys.exports;
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2
60615235e951 Added a ChartHelper class that currently contains a method to compute the xy ranges of an XYDataset.
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3 import org.jfree.data.Range;
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4 import org.jfree.data.xy.XYDataset;
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5 import org.jfree.data.time.RegularTimePeriod;
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6 import org.jfree.data.time.TimeSeriesCollection;
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7 import org.jfree.data.time.TimeSeries;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import de.intevation.flys.jfree.Bounds;
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12 import de.intevation.flys.jfree.DoubleBounds;
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13 import de.intevation.flys.jfree.TimeBounds;
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14
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15
60615235e951 Added a ChartHelper class that currently contains a method to compute the xy ranges of an XYDataset.
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16 /**
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17 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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18 */
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19 public class ChartHelper {
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20
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21 private static final Logger logger = Logger.getLogger(ChartHelper.class);
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22
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23
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24 /**
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25 * This method returns the ranges of the XYDataset <i>dataset</i> as array
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26 * with [xrange, yrange].
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27 *
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28 * @param dataset The dataset which should be evaluated.
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29 *
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30 * @return an array with x and y ranges.
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31 */
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32 public static Range[] getRanges(XYDataset dataset) {
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33 int seriesCount = dataset != null ? dataset.getSeriesCount() : 0;
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34
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35 if (seriesCount == 0) {
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36 logger.warn("Dataset is empty or has no Series set.");
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37 return null;
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38 }
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39
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40 boolean foundValue = false;
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41
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42 double minX = Double.MAX_VALUE;
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43 double maxX = -Double.MAX_VALUE;
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44 double minY = Double.MAX_VALUE;
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45 double maxY = -Double.MAX_VALUE;
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46
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47 for (int i = 0, m = seriesCount; i < m; i++) {
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48 for (int j = 0, n = dataset.getItemCount(i); j < n; j++) {
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49 double x = dataset.getXValue(i, j);
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50 double y = dataset.getYValue(i, j);
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51
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52 if (Double.isNaN(x) || Double.isNaN(y)) {
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53 logger.warn("Item " + j + " in Series " + i + " is broken");
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54 continue;
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55 }
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56
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57 foundValue = true;
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58
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59 if (x < minX) {
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60 minX = x;
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61 }
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62
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63 if (x > maxX) {
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64 maxX = x;
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65 }
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66
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67 if (y < minY) {
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68 minY = y;
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69 }
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70
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71 if (y > maxY) {
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72 maxY = y;
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73 }
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74 }
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75 }
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76
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77 return foundValue
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78 ? new Range[] { new Range(minX, maxX), new Range(minY, maxY) }
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79 : null;
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80 }
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81
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82
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83 public static Bounds[] getBounds(TimeSeriesCollection collection) {
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84 int seriesCount = collection != null ? collection.getSeriesCount() : 0;
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85
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86 if (seriesCount == 0) {
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87 logger.warn("TimeSeriesCollection is empty or has no Series set.");
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88 return null;
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89 }
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90
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91 boolean foundValue = false;
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92
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93 long lowerX = Long.MAX_VALUE;
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94 long upperX = -Long.MAX_VALUE;
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95
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96 double lowerY = Double.MAX_VALUE;
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97 double upperY = -Double.MAX_VALUE;
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98
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99 for (int i = 0, m = seriesCount; i < m; i++) {
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100 TimeSeries series = collection.getSeries(i);
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101
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102 for (int j = 0, n = collection.getItemCount(i); j < n; j++) {
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103 RegularTimePeriod rtp = series.getTimePeriod(j);
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104
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105 if (rtp == null) {
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106 continue;
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107 }
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108
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109 foundValue = true;
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110
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111 long start = rtp.getFirstMillisecond();
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112 long end = rtp.getLastMillisecond();
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113
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114 if (start < lowerX) {
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115 lowerX = start;
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116 }
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117
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118 if (end > upperX) {
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119 upperX = end;
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120 }
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121
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122 double y = series.getValue(j).doubleValue();
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123
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124 lowerY = Math.min(lowerY, y);
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125 upperY = Math.max(upperY, y);
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126 }
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127 }
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128
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129 if (foundValue) {
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130 return new Bounds[] {
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131 new TimeBounds(lowerX, upperX),
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132 new DoubleBounds(lowerY, upperY)
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133 };
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134 }
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135
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136 return null;
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137 }
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138
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139
2241
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140 /**
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141 * Expand range by percent.
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142 *
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143 * @param range The range to expand.
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144 * @param percent The percentage to expand.
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145 *
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146 * @param an expanded range.
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147 */
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148 public static Range expandRange(Range range, double percent) {
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149 if (range == null) {
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150 return null;
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151 }
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152
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153 double value = range.getLowerBound();
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154 double expand = Math.abs(value / 100 * percent);
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155
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156 return expand != 0
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157 ? new Range(value-expand, value+expand)
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158 : new Range(-0.01 * percent, 0.01 * percent);
2237
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159 }
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160 }
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161 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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